
public class ClassFileTest {
    public static final boolean FLAG = true;
    public static final byte BYTE = 123;
    public static final char X = 'X';
    public static final short SHORT = 12345;
    public static final int INT = 123455678;
    public static final long LONG = 12345678901L;
    public static final float PI = 3.14F;
    public static final double E = 2.71828;

    public ClassFileTest() {
    }

    public static void main(String[] args) throws RuntimeException {
        System.out.println("Hello World!");
        System.out.println(circumference(2));
    }

    public static float circumference(float r){
        float pi = 3.14f;
        float area =  2 * pi * r;
        return area;
    }
}
